Hi, I am a 33 year old woman, in good health. Except since I was 17, I have been passing out and struggling with skipped beats. I saw a cardiologist when I was 21 and he said I have PVC's, syncope, and sinus tachycardia. He put me on proponolol (not sure if spelled right). Eventually went off meds and have learned to live with skipped beats and passing out, really haven't thought much about it until recently. In the last couple of weeks I have been having many skipped beats when I run on the treadmill. They continue as long as I am running and quit when I stop. Just wondering if this is a concern, maybe a sign things are changing from "nothing to worry about" to "time to see a doctor". Also, don't know if it matters but my dad had a pacemaker put in a year ago because his heart was so slow he was passing out. They told him, in layman's terms, that their was a problem between his brain and heart where the signal wasn't being sent to speed up. His heart is in good shape, just doesn't keep time.